YouTube serves nearly 100 million videos per day and they can't track that amount of clips to see which clips are pirated

Google Inc.'s YouTube.com removed 29,549 video files from its popular Web site after receiving a demand from a group of Japanese media companies over copyright infringement, an industry group said on Friday.

Music, video and TV clips are posted without permission of copyright holders.

The group which represents 23 media companies said it will ask YouTube to set up screening and other measures to block postings of unauthorized files. It also called on Internet users not to post video clips in violation of copyright laws.